Hibrit uydu-hava-kara ağlarında hız bölmeli çoklu erişim tabanlı FSO/RF iletim

Year 2024, Volume: 13 Issue: 2, 460 - 466, 15.04.2024

Mehmet Can İbrahim Altunbaş

https://doi.org/10.28948/ngumuh.1365940

Abstract

Bu çalışmada, uydunun röle görevi gören yüksek irtifalı platform istasyonu (high altitude platform station, HAPS) yardımıyla birden çok kullanıcıyla hız bölmeli çoklu erişim (rate-splitting multiple access, RSMA) tekniğini kullanarak haberleşme sağladığı sistemin performansı incelenmiştir. Uydu ile HAPS arasında serbest alan optik (free space optics, FSO) bağlantısı varken HAPS ile kullanıcılar arasında radyo frekansı (radio frequency, RF) bağlantısı vardır. RF ve FSO haberleşmesi kullanan hibrit-uydu-hava kara ağları için uygun kanal modelleri dikkate alınarak ele alınan sistemde kullanıcıların kesinti olasılığı ifadeleri kapalı formda elde edilmiştir ve bilgisayar benzetimleri ile doğrulanmıştır. Kullanıcıların ve sistemin verimi, kesinti olasılıkları kullanılarak hesaplanmıştır. Farklı gölgeleme ve türbülans etkilerinin kullanıcıların kesinti performansına etkisi incelenmiştir. Ayrıca RSMA tabanlı sistem ile dik olmayan çoklu erişim (nonorthogonal multiple access, NOMA) tabanlı sistemin verimleri karşılaştırılmıştır ve RSMA tabanlı sistemin artan kullanıcı sayısıyla beraber daha iyi performans sergilediği gösterilmiştir. Örneğin, iletim gücü 20 dBm ve 4 kullanıcılı durum için RSMA, sistem verimi açısından NOMA’ya göre 0.16 bpcu kazanç sağlamaktadır.

Keywords

Hibrit uydu-hava-kara ağları, Hız bölmeli çoklu erişim, FSO/RF, Kesinti olasılığı, Sistem verimi

Rate splitting multiple access-based FSO/RF transmission in hybrid satellite-aerial-terrestrial networks

Abstract

In this work, the performance of the system in which the satellite communicates with multiple users by means of a high altitude platform station (HAPS), which is served as a relay, using the rate-splitting multiple access (RSMA) technique is investigated. The link between satellite and HAPS is free space optic (FSO) while the links between HAPS and users are radio frequency (RF). Using appropriate channel models for the considered hybrid satellite-aerial-terrestrial networks with FSO/RF transmission, the outage probability expressions of the users are derived in closed form and validated by computer simulations. The throughput of the users and the system is calculated by using outage probabilities. The effect of various shadowing and turbulence effects on the user outage performance is studied. Moreover, the RSMA-based system and the non-orthogonal multiple access (NOMA)-based system are compared in terms of system throughput and it is shown that the RSMA-based system outperforms the NOMA-based system with the increasing number of users. For example, for a 20 dBm transmit power in a 4-user scenario, RSMA provides a 0.16 bpcu throughput gain over NOMA.

Keywords

Hybrid satellite-aerial-terrestrial networks, Rate-splitting multiple access (RSMA), FSO/RF, Outage probability, Throughput

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